Camshaft arrangement

Abstract

A camshaft arrangement ( 1 ) for changing the relative angle position of at least one cam of a camshaft ( 2 ) relative to a second cam of the camshaft ( 2 ), wherein the arrangement includes an angular adjustment device ( 3 ) having a stator ( 4 ) and a rotor ( 5 ) which is arranged such that it can be rotated relative thereto. The rotor ( 5 ) is connected to a shaft ( 6 ) in a rotationally fixed manner, the stator ( 4 ) is connected to a hollow shaft ( 7 ) in a rotationally fixed manner, and the shaft ( 6 ) and the hollow shaft ( 7 ) are arranged concentrically to one another. The at least one first cam is connected to the shaft ( 6 ) in a rotationally fixed manner and the at least one second cam is connected to the hollow shaft ( 7 ) in a rotationally fixed manner. In order to establish a fixed connection between stator and hollow shaft, which requires little space, the rotationally fixed connection between stator ( 4 ) and hollow shaft ( 7 ) is established via a cover element ( 8 ) that is rigidly connected to the stator ( 4 ), wherein the cover element ( 8 ) includes a borehole ( 9 ) for receiving a cylindrical section ( 10 ) of the hollow shaft ( 7 ) and a force-fitting and/or form-fitting connection between cover element ( 8 ) and hollow shaft ( 7 ) is formed.

The invention claimed is: 
     
       1. A camshaft arrangement for varying a relative angle position of at least one first cam of a camshaft relative to a second cam of the camshaft, comprising an angle adjustment device which has a stator and a rotor which is arranged so as to be rotatable relative to said stator, the rotor is connected in a rotationally fixed manner to a shaft, the stator is connected in a rotationally fixed manner to a hollow shaft, the shaft and the hollow shaft are arranged concentrically with respect to one another, the at least one first cam is connected in a rotationally fixed manner to the shaft and the at least one second cam is connected in a rotationally fixed manner to the hollow shaft the rotationally fixed connection between the stator and the hollow shaft is produced by a cover element which is fixedly connected to the stator, the cover element has a bore for receiving a cylindrical portion of the hollow shaft, and at least one of a non-positively locking or cohesive connection is provided at a cylindrical contact surface between the cover element and the hollow shaft. 
     
     
       2. The camshaft arrangement as claimed in  claim 1 , wherein the bore is arranged concentrically with respect to the shaft and the hollow shaft. 
     
     
       3. The camshaft arrangement as claimed in  claim 1 , wherein the cover element is screwed to the stator. 
     
     
       4. The camshaft arrangement as claimed in  claim 1 , wherein the non-positively locking connection is produced by an interference fit or shrink fit between the bore and the cylindrical portion. 
     
     
       5. The camshaft arrangement as claimed in  claim 4 , wherein the cover element has a constant thickness (d) in an axial direction of the shaft and the hollow shaft, and the cover element has an increased thickness (D) in a region of the bore in order to increase a length of the cylindrical contact surface. 
     
     
       6. The camshaft arrangement as claimed in  claim 5 , wherein the cover element has a planar face side and a widening due to the increased thickness (D) that extends into an interior of the arrangement. 
     
     
       7. The camshaft arrangement as claimed in  claim 1 , wherein the cohesive connection is produced by a welded connection of the cover element and the hollow shaft. 
     
     
       8. The camshaft arrangement as claimed in  claim 7 , wherein the welded connection is a laser-welded or electron beam-welded connection. 
     
     
       9. The camshaft arrangement as claimed in  claim 1 , wherein the cohesive connection is produced by a soldered connection of the cover element and the hollow shaft. 
     
     
       10. The camshaft arrangement as claimed in  claim 9 , wherein the soldered connection is a brazed connection. 
     
     
       11. The camshaft arrangement as claimed in  claim 1 , wherein the cohesive connection is produced by an adhesive connection of the cover element and the hollow shaft. 
     
     
       12. The camshaft arrangement as claimed in  claim 1 , wherein both the non-positively locking connection and the cohesive connection are provided between the cover element and the hollow shaft. 
     
     
       13. The camshaft arrangement as claimed in  claim 1 , wherein the shaft is connected to the rotor by a screw connection. 
     
     
       14. The camshaft arrangement as claimed in  claim 13 , wherein the screw connection comprises a central screw arranged coaxially with respect to the shaft. 
     
     
       15. The camshaft arrangement as claimed in  claim 1 , wherein the angle adjustment device comprises a hydraulic adjustment device.